Method for transceiving signal in association with multi-homing based PSA addition in wireless communication system and apparatus therefor

Abstract

An embodiment of the present invention relates to a method for transceiving a signal, by a user equipment (UE), in association with multi-homing based PSA addition in a wireless communication system, the method comprising the steps of: establishing a protocol data unit (PDU) session with a first protocol data unit session anchor (PSA); and receiving a new IP address from a session management function (SMF), wherein when the received new IP address is associated with multi-homing based PSA addition, the UE skips performing IMS registration using the new IP address.

The invention claimed is: 
     
       1. A method of receiving signals in relation to multi-homing-based protocol data unit session anchor (PSA) addition by a user equipment (UE) in a wireless communication system, the method comprising:
 establishing, by the UE, a protocol data unit (PDU) session with a first PSA; 
 receiving, by the UE from a session management function (SMF), a new Internet protocol (IP) address; and 
 receiving information informing that the new IP address is related to a multi-homing-based PSA addition, 
 wherein, based on the received information informing that the new IP address is related to the multi-homing-based PSA addition: 
 an IP multimedia subsystem (IMS) registration using the new IP address is skipped; and 
 a non-access stratum (NAS) layer of the UE provides an upper layer with information indicating that the new IP address is for IMS media routing. 
 
     
     
       2. The method according to  claim 1 , wherein based on that the received new IP address is related to the multi-homing-based PSA addition, the new IP address is used for IMS media routing to an added second PSA. 
     
     
       3. The method according to  claim 1 , wherein based on that the received new IP address is related to the multi-homing-based PSA addition, the NAS layer of the UE provides the upper layer with information indicating that the new IP address is only for IMS media. 
     
     
       4. The method according to  claim 1 , wherein the new IP address is a new IP version 6 (IPv6) prefix. 
     
     
       5. The method according to  claim 1 , wherein the upper layer is an IMS layer. 
     
     
       6. The method according to  claim 2 , wherein the second PSA is a localized user plane function (UPF). 
     
     
       7. The method according to  claim 1 , wherein the first PSA is a user plane function (UPF). 
     
     
       8. A user equipment (UE) for transmitting and receiving signals in relation to multi-homing-based protocol data unit session anchor (PSA) addition in a wireless communication system, the UE comprising:
 a memory; 
 a transceiver; and 
 at least one processor operatively coupled to the memory and the transceiver, 
 wherein the at least one processor is configured to: 
 establish a protocol data unit (PDU) session with a first PSA; 
 control the transceiver to receive, from a session management function (SMF), a new Internet protocol (IP) address; and 
 control the transceiver to receive information informing that the new IP address is related to a multi-homing-based PSA addition, 
 wherein, based on the received information informing that the new IP address is related to the multi-homing-based PSA addition: 
 an IP multimedia subsystem (IMS) registration using the new IP address is skipped; and 
 a non-access stratum (NAS) layer of the UE provides an upper layer with information indicating that the new IP address is for IMS media routing. 
 
     
     
       9. The UE according to  claim 8 , wherein based on that the received new IP address is related to the multi-homing-based PSA addition, the new IP address is used for IMS media routing to an added second PSA. 
     
     
       10. The UE according to  claim 8 , wherein based on that the received new IP address is related to the multi-homing-based PSA addition, the NAS layer of the UE provides the upper layer with information indicating that the new IP address is only for IMS media.